linux-kernel - Re: [PATCH 1/3] platform: olpc: mark SPI related data as maybe unused

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Date:   Thu, 16 Mar 2023 13:50:10 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Mark Gross <markgross@...nel.org>,
        Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>,
        Daniel Oliveira Nascimento <don@...t.com.br>,
        Mattia Dongili <malattia@...ux.it>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] platform: olpc: mark SPI related data as maybe unused

Hi Krzysztof,

On 3/12/23 14:26, Krzysztof Kozlowski wrote:
> The driver can be compile tested as built-in making certain data unused:
> 
>   drivers/platform/olpc/olpc-xo175-ec.c:737:35: error: ‘olpc_xo175_ec_id_table’ defined but not used [-Werror=unused-const-variable=]
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
>  drivers/platform/olpc/olpc-xo175-ec.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/olpc/olpc-xo175-ec.c b/drivers/platform/olpc/olpc-xo175-ec.c
> index 4823bd2819f6..04573495ef5a 100644
> --- a/drivers/platform/olpc/olpc-xo175-ec.c
> +++ b/drivers/platform/olpc/olpc-xo175-ec.c
> @@ -734,7 +734,7 @@ static const struct of_device_id olpc_xo175_ec_of_match[] = {
>  };
>  MODULE_DEVICE_TABLE(of, olpc_xo175_ec_of_match);
>  
> -static const struct spi_device_id olpc_xo175_ec_id_table[] = {
> +static const struct spi_device_id olpc_xo175_ec_id_table[] __maybe_unused = {
>  	{ "xo1.75-ec", 0 },
>  	{}
>  };
>  MODULE_DEVICE_TABLE(spi, olpc_xo175_ec_id_table);

The whole presence of the olpc_xo175_ec_id_table[] seems to make little sense.

This should be referenced by:

static struct spi_driver olpc_xo175_ec_spi_driver = {

Like this:

        .probe          = olpc_xo175_ec_probe,
        .remove         = olpc_xo175_ec_remove,
+       .id_table       = olpc_xo175_ec_id_table,

Otherwise those ids cannot be used to load the driver the non DT/of way. Since the driver assumingly does actually bind already this means that it is only used the DT/of way and it seems to me that the whole olpc_xo175_ec_id_table[] can be removed entirely.

Exposing modaliases for a non supported way of binding the driver does not really seem useful ?

Patches 2/3 and 3/3 do make sense, I'll merge those soonish.

Regards,

Hans